Author Question: What percent of opacity means the exhaust has no visible smoke and does not block light from a beam ... (Read 254 times)

captainjonesify · **on:** Jun 23, 2018

What percent of opacity means the exhaust has no visible smoke and does not block light from a beam projected through the exhaust smoke?

A) 25 B) 100 C) 50 D) 0

Question 2

What percent of opacity means that the exhaust is so dark that it completely blocks light from a beam projected through the exhaust smoke?

A) 25 B) 100 C) 50 D) 0